There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Mansa Musa I of Mali. When we think of the worldâs all-time richest people, names like Bill Gates, Warren Buffet and John D Rockefeller immediately come to mind.But few would have thought, or even heard of, Mansa Musa I of Mali â the obscure 14th century African king who was today named the richest person in all history.eanwhile John D. Rockefeller, third on the list, is the richest American to have ever lived, worth $340billion in today's USD at the time of his death in 1937.